.leftbox{
    width: 400px;
    height: 400px;
    margin:20px 0px 0px 0px;
    position: relative;
    
}
.leftbox img{
    width: 400px;
    height: 400px;
}
.leftbox .mark{
    width: 200px;
    height: 200px;
    background-color: rgba(0,0,0,0.3);
    position: absolute;
    top:0px;
    left: 0px;
    display: none;
}
.div1 ul{
    margin:10px 0px 0px 30px;
}
.div1 ul li{
    list-style: none;
    width: 75px;
    height: 75px;
    float: left;
    margin-right: 5px;
}
.div1 ul li img{
    width: 75px;
    height: 75px;
}
.rightbox{
    width: 388px;
    height: 388px;
    border:6px solid #fff;
    position: absolute;
    margin-left: 420px;
    top:180px;
    overflow: hidden;
    display: none;
    box-shadow: 1px 3px 5px rgba(0,0,0,.2);
    z-index: 99;
}
.rightbox img{
    width: 788px;
    height: 788px;
    position: absolute;
}
.div1{
    width: 960px;
    margin: 0 auto;
    overflow: hidden;
}